/*
 * Copyright 2023 WangHongEn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import 'package:crypton/crypton.dart';

class RSABrain {
  RSABrain() {
    _myRsaKeypair = RSAKeypair.fromRandom();
  }

  late RSAKeypair _myRsaKeypair;
  RSAPublicKey? _receiverRsaPublicKey;

  void setReceiverPublicKey(String pubKey) {
    try {
      _receiverRsaPublicKey = RSAPublicKey.fromString(pubKey);
    } catch (error) {
      _receiverRsaPublicKey = null;
    }
  }

  String getOwnPublicKey() {
    return _myRsaKeypair.publicKey.toString();
  }

  String? encryptTheSetterMessage(String message) {
    try {
      return _receiverRsaPublicKey!.encrypt(message); //null check: !
    } catch (error) {
      return null;
    }
  }

  String? decryptTheGetterMessage(String message) {
    try {
      return _myRsaKeypair.privateKey.decrypt(message);
    } catch (error) {
      return null;
    }
  }
}
